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From: David Brownell <david-b@pacbell.net>
To: Ingo Molnar <mingo@elte.hu>, linux-kernel@vger.kernel.org,
       tglx@linutronix.de
Subject: [patch/rfc 0/2] handle_threaded_irq()
Date: Tue, 17 Mar 2009 19:14:53 -0700
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Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>, me@felipebalbi.com,
       dmitry.torokhov@gmail.com, sameo@openedhand.com
References: <1235762883-20870-1-git-send-email-me@felipebalbi.com> <200903021633.08736.david-b@pacbell.net> <20090303004427.GA8638@elte.hu>
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This is a followup to help address one of the omissions in the
threaded IRQ patches (v2) posted recently.  To recap, those
provided a quickcheck() routine that could wake an irq thread,
and a way to register a handler using that mechanism.

This addresses an orthogonal problem:  given some thread
demultiplexing the subsidiary IRQs reported to some top-level
interrupt, how can that kick in flow handlers chaining to
the subsidiary IRQs' handlers?

The answer here is more or less as suggested by Thomas:
using handle_threaded_irq(), a flow handler which doesn't
use handle_IRQ_event() since that doesn't much like being
called from thread context, at least when lockdep is active.

These two patches:

 - add handle_threaded_irq() flow handler;
 - kick it in for some twl4030 code

Tested on 2.6.29-rc8 code, both with and without the v2
irqthread patches.


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